A surgical rapid response is called for a patient experiencing acute deterioration on the … — USMLE Step 2 CK

A surgical rapid response is called for a patient experiencing acute deterioration on the surgical ward. The patient, a $68$ -year-old male, underwent an uncomplicated laparoscopic repair of a large type III paraesophageal hernia $48$ hours ago. His medical history is significant for hypertension, type $2$ diabetes mellitus, and polymyalgia rheumatica. He has been taking amlodipine, metformin, and prednisone ( $15$ mg daily) for the past year. Due to severe postoperative nausea and emesis, he has been strictly nil per os (NPO) since the surgery and has only received intravenous lactated Ringer solution and prochlorperazine. Currently, he appears lethargic. Vital signs reveal a temperature of $37.4^\circ\text{C}$ ( $99.3^\circ\text{F}$ ), heart rate of $128$ /min, respiratory rate of $22$ /min, and blood pressure of $78/48$ mmHg. Physical examination shows dry mucous membranes and a non-distended, soft, and non-tender abdomen. His surgical port sites are clean without erythema. An electrocardiogram demonstrates sinus tachycardia. Laboratory studies are returned as follows:

* Sodium: $126$ mEq/L
* Potassium: $5.6$ mEq/L
* Chloride: $94$ mEq/L
* Bicarbonate: $18$ mEq/L
* Blood urea nitrogen: $32$ mg/dL
* Creatinine: $1.4$ mg/dL
* Glucose: $52$ mg/dL

Which of the following is the most appropriate initial step in the management of this patient?

Administration of intravenous hydrocortisone and 0.9% normal salineAnswer
B
Collection of blood cultures and administration of empiric broad-spectrum antibiotics
C
Urgent computed tomography of the abdomen and pelvis with intravenous contrast
D
Immediate transfer to the operating room for exploratory laparotomy
E
Administration of intravenous 50% dextrose and a continuous insulin infusion

Answer

Administration of intravenous hydrocortisone and 0.9% normal saline

The correct intervention involves immediately providing exogenous glucocorticoids and isotonic fluids. This patient is experiencing an acute adrenal crisis, characterized by refractory hypotension, lethargy, hyponatremia, hyperkalemia, and hypoglycemia. His prolonged use of prednisone for polymyalgia rheumatica caused suppression of his hypothalamic-pituitary-adrenal (HPA) axis. Because he was strictly nil per os (NPO) postoperatively and did not receive his home steroids or stress-dose coverage, he cannot mount the necessary cortisol response to surgical stress. Intravenous hydrocortisone provides both the glucocorticoid and mineralocorticoid activity required to reverse the shock, while normal saline restores intravascular volume.

Step-by-Step Solution

Analyze the patient's preoperative medication history and current clinical state.

The patient has a history of chronic prednisone use and has been strictly NPO postoperatively, meaning he missed his daily glucocorticoid doses during a period of high surgical stress.

Identifying missing critical home medications is essential in diagnosing postoperative decompensation.

Interpret the laboratory abnormalities in the context of refractory hypotension.

The patient exhibits a classic triad of hyponatremia, hyperkalemia, and hypoglycemia, alongside a non-anion gap metabolic acidosis and prerenal azotemia.

These specific metabolic derangements differentiate an endocrine etiology from other common causes of postoperative shock, such as sepsis or hemorrhage.

Synthesize findings to establish the diagnosis.

The combination of chronic HPA axis suppression, missed steroid doses, surgical stress, distributive shock, and the classic electrolyte triad points definitively to an acute adrenal crisis (Addisonian crisis).

Chronic exogenous steroids suppress the endogenous production of cortisol. Without stress-dose coverage or resumption of home doses, the body cannot maintain vascular tone or glucose/electrolyte homeostasis after surgery.

Select the appropriate therapeutic intervention.

Immediate fluid resuscitation with 0.9% normal saline and stress-dose intravenous corticosteroids (hydrocortisone) is required.

Hydrocortisone provides both glucocorticoid and mineralocorticoid activity to reverse the shock and metabolic derangements.

Key Concept

Postoperative Adrenal Crisis Management

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